I've got 2 of these for my bike to increase night time visibility of me and the bike from lateral angles.

The light comes on when this little think gets shaken, I've ordered blue and it's very nice and powerful, it's visible (for tests) even in daylight.

It also comes with an adapter for small tire ventils (inflate hole)

Was very surprised to receive the products in 10 Days (minimum delivery time) and even more surprised to receive them at my door directly by a delivery man... in ROMANIA, very satisfied with the delivery